organs, held in the hollow between the two lobes which apply it to the free edge of the
tube is accurately fitted, pours out the secretion that fixes it (Arnold Watson)
Genus CXXXVII.—Petta, Malmgren, 1865.
I h B B B B H “ entire bprder: OTa> ™il H a smooth
crenulate d R H H B H tbe firsfc 8eSment emarginate in the centre ventrally and
B B d V K B E°W °f ey6S OTer brain-M m B i I tbe foartb aad fifth segments (Nilsson ). B The v eonrtgraaln boforlddeerd oaf st hine
in the ««ntre, making two rounded lobes. Cement-
IH— first h Hill I « segments, opening between the second branchia and the
I M Seventeen fascicles of bristles and fourteen lamella, for the hooks on Hooks which commence on the third segment, pectiniform; two large teeth
coaauuddadl uprronc ess witth/ Estraigh9t shiafts 3 aSnmd° 0stlihglyh trly° Uh1,o,?oekde dpr 0tWips' . BArinstteler-ifoirh «n hepohorki!d ioaf tnhoet
longer than the posterior. Tube very little curved, composed of minute fragments of
n H H n B °r “ “ Ute flattened blaok and fragments
1. Putt*tto pusilla,i thfe Malmgren,exBtenoBr pale"1865.mB stiou Plate CXXV,o1adeBr figs. 7-7y-bristles, hooks, scapha.
like H M B i B B B Dine *° el6Ten °n 6ach 8ide' base Pale witb trumpet-
PPoouurr ffive“ 'off ter and“ bdr thanI th eto o ath belrusn-tC raoruunsd. ed Upopipnet.r
H H H I ■ 0b!;^ back™ d and has no rim. It curves round L
• S1 v ,6 P ,e°lffi and ends at tbe ant®rior cirrus, a smooth area (of the crown)
^a sJrTBlfBII BBi tBhe HBmIB be‘WBeen D °f B an da rtcbbe’ BwW e |B a high arch and VenW side of fourth segment has a plate with a knobbed lobe- e(H ethssrelee) . papBilolad,y.
bevond BB BI W M 80 tbattbe oaadal aPP»AH projects little
H H i B B flattened; d0rsal rf * * segment nearly
™ r f■ L r Z Bt ° r WI BtbMea a afnadtt e”ne tdh ela mmeildlda lew itlihB ea ar oduenedPe dr roptocslit;e riao rr aetnhde ra nlodn lg
■of which sB rlB” fZolloB7 WlBth fo“r| f iBmbriae bBetween thBiyse asn °dn t hseo avPebnat, ■the lo w"er edige m m on eapb side- HHin fourth'fiftb>8ixtb.IB eighth segments. A diaphragm occurs between the fourth and fifth segments.
— B B divided into three anterior without hooks and fourteen
■ H H T WS 1 b0°kS- B™tleS of two ti^ a -a to u t tapering bristles with
a hair like B "Im B tbose B a spear-head expansion of the tip which ends in
Bprow— — M B °n a modueifeine dS teogomthe nw-8it’ hW ai tshp ian oBubso ertd gbea,s aaln dp rao csemsso ootrh lsyh raefdt, dtwedo prow beneath, the basal line from which is sinuous. Tube slightly tapered and curved,
formed of coarse but generally regular grains of sand neatly cemented ; occasionally
smoothly rounded and larger grains are used, or even entire shells (e. g. Bissoa), as well as
fragments of others and stones.
S ynonyms.
1865. Petta pusilla, Malmgren. Nord. Hafs.-Annul., p. 361, Tab. xviii, fig. 43.
1867. „ • „ idem. Annul. Polych., p. 104.
1871. ,, „ ^ -Grube. Schles. Gesell. (1870), p. 75, sep. abdr., pp. 4 and 8.
1874. „ • ,, Malm. Göteborg. Fauna, p. 94.
1878. „ „ Storm. Kong. Norske Vid.-selsk. Skrifter, p. 243.
1879. Pectinaria pusilla, Tauber. Annul. Danica, p. 127.
1885. Petta pusilla, Carus. Fauna Medit., vol. i, p. 261.
1893. ,, ,, Lo Bianco. Atti R. Accad. Sc. Napoli, vol. v, No. 11, p. 48.
1894. Pectinaria pusilla, Bidenkap. Christ. Vefc.-Akad. Forhandl., p. 120.
1896. ,, - „ Appellöf, Berg. Mus. Aarb., p. 12,
1897. ,, „ Michaelsen. Polych. deutsch. Meere., p. 160.
1900. „ . ,, Gemmill. Fauna of Clyde, p. 359.
1909. Petta pusilla, Fauvel. Bull. Inst. Ocean., cxlii, p. 21.
1911-12. „ „ Nilsson. Zool. Bidrag Uppsala, Bd. i, pp. 138—9.
1912. „ „ Crawshay. Journ. M. B. A., vol. ix, p. 346.
,, Pectinaria pusilla, Wollebcek. Skrift. Vid.-selsk. Krist., No. 18, p. 35, pi. iii, figs. 1—8.
1914. Petta pusilla, McIntosh. Ann. Nat. Hist., ser. 8, vol. xiii, p. 94.
„ „ ,, Fauvel. . Campag. Scient. Mouaco, Fasc. xlvi, p. 279, pi. xxv, figs. 22, 26.
1915, „ Allen. Journ. M. B. A., vol. x, p. 637.
1917. ,, ,, Hessle. Zool. Bidr. Uppsala, No. 5, p. 83.
Habitat'.-—Dredged in the “ Porcupine” Expedition of 1869 off Ireland in 422 fathoms;
dredged in 567 fathoms in the Atlantic “ Porcupine ” Expedition, 1870; S.W. Ireland, off
Co. Kerry, and in the same region at 52-| fathoms during the Royal Irish Academy’s
Expedition of 1886 ; Firth of Clyde (Dr. David Robertson) ; Plymouth (Crawshay); Irish
Sea (Arnold Watson).
It extends to Sweden (S. Loven, Malm, Hessle) and Northern Seas; Mediterranean
(Marseilles, Marion); Fayal, Azores and the Atlantic (Fauvel).
The crown has eleven paleolse on each side, with a pale base which is expanded at
the end, the shaft being flattened, little dilated, and then tapered to a blunt (rounded)
point. In developing paleolse a translucent process passes from the blunt tip. The blunt
points of these and the coarser nature of the tube as compared with Lagis Koreni are
interesting. The five outer paleolse are larger than the others (Lo Bianco), The upper
area slopes obliquely backward, and has a smooth edge without a rim. It extends to the
ventral edge of the paleolse, where it .ends at the anterior cirrus, a smooth area occurring
below the paleolse—that is, between them and the veil. This process is clearly a development
of the flattened area of the. crown and is independent of the veil. The veil has a
high arch and a smooth border, but in two examples the highest point of the arch had
three papillse close to each other, the rest of the margin being quite smooth. The veil is
of moderate breadth, is attached to the roof of the oral region and gives origin to the
tentacles, which form the usual lateral groups and have the typical structure.